Sennin-buro/Kawayu Onsen

仙人風呂/川湯温泉

December 1-end of February

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Sennin Buro refers to famous rotenburo (open air bath) at Kawayu Onsen (hot springs) which is only available during winter from December to February. Hot water wells up by digging at the river bank, creating an exclusive rotenburo. This massive hot spring with a capacity of nearly 1,000 people (or ''sennin" in Japanese) can be entered when wearing a bathing suit.